Misc polishing fixes for Settings

- Never return null when querying userDictionaryLocales
- Auto mirror mobile setting icon in RTL to match status bar.

Fixes: 65298627
Fixes: 65361092
Test: robotests
Change-Id: I0f9827f7bc23baf4895712c0f86584aeccfb9c73

res/drawable/ic_network_cell.xml

@@ -14,6 +14,7 @@
     limitations under the License.
 -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:autoMirrored="true"
         android:width="24dp"
         android:height="24dp"
         android:viewportWidth="24.0"

src/com/android/settings/inputmethod/UserDictionaryList.java

@@ -22,6 +22,7 @@ import android.content.Intent;
 import android.database.Cursor;
 import android.os.Bundle;
 import android.provider.UserDictionary;
+import android.support.annotation.NonNull;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceGroup;
 import android.text.TextUtils;
@@ -78,14 +79,15 @@ public class UserDictionaryList extends SettingsPreferenceFragment {
         mLocale = locale;
     }
 
+    @NonNull
     public static TreeSet<String> getUserDictionaryLocalesSet(Context context) {
         final Cursor cursor = context.getContentResolver().query(
                 UserDictionary.Words.CONTENT_URI, new String[]{UserDictionary.Words.LOCALE},
                 null, null, null);
-        final TreeSet<String> localeSet = new TreeSet<String>();
-        if (null == cursor) {
-            // The user dictionary service is not present or disabled. Return null.
-            return null;
+        final TreeSet<String> localeSet = new TreeSet<>();
+        if (cursor == null) {
+            // The user dictionary service is not present or disabled. Return empty set.
+            return localeSet;
         }
         try {
             if (cursor.moveToFirst()) {
@@ -134,6 +136,7 @@ public class UserDictionaryList extends SettingsPreferenceFragment {
 
     /**
      * Creates the entries that allow the user to go into the user dictionary for each locale.
+     *
      * @param userDictGroup The group to put the settings in.
      */
     protected void createUserDictSettings(PreferenceGroup userDictGroup) {
@@ -163,6 +166,7 @@ public class UserDictionaryList extends SettingsPreferenceFragment {
 
     /**
      * Create a single User Dictionary Preference object, with its parameters set.
+     *
      * @param locale The locale for which this user dictionary is for.
      * @return The corresponding preference.
      */
@@ -172,10 +176,11 @@ public class UserDictionaryList extends SettingsPreferenceFragment {
         if (null == locale) {
             newPref.setTitle(Locale.getDefault().getDisplayName());
         } else {
-            if ("".equals(locale))
+            if ("".equals(locale)) {
                 newPref.setTitle(getString(R.string.user_dict_settings_all_languages));
-            else
+            } else {
                 newPref.setTitle(Utils.createLocaleFromString(locale).getDisplayName());
+            }
             intent.putExtra("locale", locale);
             newPref.getExtras().putString("locale", locale);
         }

tests/robotests/src/com/android/settings/inputmethod/UserDictionaryListTest.java

@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.inputmethod;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.ContentProvider;
+import android.content.ContentValues;
+import android.database.Cursor;
+import android.database.MatrixCursor;
+import android.net.Uri;
+import android.provider.UserDictionary;
+
+import com.android.settings.TestConfig;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+import org.robolectric.shadows.ShadowContentResolver;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class UserDictionaryListTest {
+
+    private FakeProvider mContentProvider;
+
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContentProvider = new FakeProvider();
+        ShadowContentResolver.registerProvider(UserDictionary.AUTHORITY, mContentProvider);
+    }
+
+    @Test
+    public void getUserDictionaryLocalesSet_noLocale_shouldReturnEmptySet() {
+        mContentProvider.hasDictionary = false;
+
+        assertThat(UserDictionaryList.getUserDictionaryLocalesSet(RuntimeEnvironment.application))
+                .isEmpty();
+    }
+
+    public static class FakeProvider extends ContentProvider {
+
+        public boolean hasDictionary = true;
+
+        @Override
+        public boolean onCreate() {
+            return false;
+        }
+
+        @Override
+        public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
+                String sortOrder) {
+            if (hasDictionary) {
+                final MatrixCursor cursor = new MatrixCursor(
+                        new String[]{UserDictionary.Words.LOCALE});
+                cursor.addRow(new Object[]{"en"});
+                cursor.addRow(new Object[]{"es"});
+                return cursor;
+            } else {
+                return null;
+            }
+        }
+
+        @Override
+        public String getType(Uri uri) {
+            return null;
+        }
+
+        @Override
+        public Uri insert(Uri uri, ContentValues values) {
+            return null;
+        }
+
+        @Override
+        public int delete(Uri uri, String selection, String[] selectionArgs) {
+            return 0;
+        }
+
+        @Override
+        public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
+            return 0;
+        }
+    }
+}